Remove some dead code, simplify calling convention.
This commit is contained in:
Tom Lane
parent
cee82fab71
commit
bbb7b6f699
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@ -1,13 +1,13 @@
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/*-------------------------------------------------------------------------
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*
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* rewriteHandler.c
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* Primary module of query rewriter.
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*
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* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/rewrite/rewriteHandler.c,v 1.94 2001/06/12 18:54:22 tgl Exp $
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* $Header: /cvsroot/pgsql/src/backend/rewrite/rewriteHandler.c,v 1.95 2001/06/13 18:56:30 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -27,16 +27,16 @@
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#include "parser/parse_target.h"
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#include "parser/parsetree.h"
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#include "parser/parse_type.h"
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#include "rewrite/rewriteHandler.h"
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#include "rewrite/rewriteManip.h"
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#include "utils/lsyscache.h"
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static RewriteInfo *gatherRewriteMeta(Query *parsetree,
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Query *rule_action,
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Node *rule_qual,
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int rt_index,
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CmdType event,
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bool instead_flag);
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static Query *rewriteRuleAction(Query *parsetree,
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Query *rule_action,
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Node *rule_qual,
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int rt_index,
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CmdType event);
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static List *adjustJoinTreeList(Query *parsetree, bool removert, int rt_index);
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static void markQueryForUpdate(Query *qry, bool skipOldNew);
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static List *matchLocks(CmdType event, RuleLock *rulelocks,
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@ -45,40 +45,33 @@ static Query *fireRIRrules(Query *parsetree);
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/*
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* gatherRewriteMeta -
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* Gather meta information about parsetree, and rule. Fix rule body
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* and qualifier so that they can be mixed with the parsetree and
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* maintain semantic validity
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* rewriteRuleAction -
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* Rewrite the rule action with appropriate qualifiers (taken from
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* the triggering query).
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*/
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static RewriteInfo *
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gatherRewriteMeta(Query *parsetree,
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static Query *
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rewriteRuleAction(Query *parsetree,
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Query *rule_action,
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Node *rule_qual,
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int rt_index,
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CmdType event,
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bool instead_flag)
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CmdType event)
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{
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RewriteInfo *info;
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int current_varno,
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new_varno;
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int rt_length;
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Query *sub_action;
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Query **sub_action_ptr;
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int rt_length;
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info = (RewriteInfo *) palloc(sizeof(RewriteInfo));
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info->rt_index = rt_index;
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info->event = event;
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info->instead_flag = instead_flag;
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info->rule_action = (Query *) copyObject(rule_action);
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info->rule_qual = (Node *) copyObject(rule_qual);
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if (info->rule_action == NULL)
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{
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info->nothing = TRUE;
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return info;
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}
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info->nothing = FALSE;
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info->action = info->rule_action->commandType;
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info->current_varno = rt_index;
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/*
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* Make modifiable copies of rule action and qual (what we're passed
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* are the stored versions in the relcache; don't touch 'em!).
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*/
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rule_action = (Query *) copyObject(rule_action);
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rule_qual = (Node *) copyObject(rule_qual);
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current_varno = rt_index;
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rt_length = length(parsetree->rtable);
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info->new_varno = PRS2_NEW_VARNO + rt_length;
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new_varno = PRS2_NEW_VARNO + rt_length;
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/*
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* Adjust rule action and qual to offset its varnos, so that we can
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@ -88,14 +81,14 @@ gatherRewriteMeta(Query *parsetree,
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* will be in the SELECT part, and we have to modify that rather than
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* the top-level INSERT (kluge!).
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*/
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sub_action = getInsertSelectQuery(info->rule_action, &sub_action_ptr);
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sub_action = getInsertSelectQuery(rule_action, &sub_action_ptr);
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OffsetVarNodes((Node *) sub_action, rt_length, 0);
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OffsetVarNodes(info->rule_qual, rt_length, 0);
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OffsetVarNodes(rule_qual, rt_length, 0);
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/* but references to *OLD* should point at original rt_index */
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ChangeVarNodes((Node *) sub_action,
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PRS2_OLD_VARNO + rt_length, rt_index, 0);
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ChangeVarNodes(info->rule_qual,
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ChangeVarNodes(rule_qual,
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PRS2_OLD_VARNO + rt_length, rt_index, 0);
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/*
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@ -135,8 +128,8 @@ gatherRewriteMeta(Query *parsetree,
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keeporig = (!rangeTableEntry_used((Node *) sub_action->jointree,
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rt_index, 0)) &&
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(rangeTableEntry_used(info->rule_qual, rt_index, 0) ||
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rangeTableEntry_used(parsetree->jointree->quals, rt_index, 0));
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(rangeTableEntry_used(rule_qual, rt_index, 0) ||
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rangeTableEntry_used(parsetree->jointree->quals, rt_index, 0));
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newjointree = adjustJoinTreeList(parsetree, !keeporig, rt_index);
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sub_action->jointree->fromlist =
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nconc(newjointree, sub_action->jointree->fromlist);
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@ -146,7 +139,8 @@ gatherRewriteMeta(Query *parsetree,
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* We copy the qualifications of the parsetree to the action and vice
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* versa. So force hasSubLinks if one of them has it. If this is not
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* right, the flag will get cleared later, but we mustn't risk having
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* it not set when it needs to be.
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* it not set when it needs to be. (XXX this should probably be handled
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* by AddQual and friends, not here...)
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*/
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if (parsetree->hasSubLinks)
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sub_action->hasSubLinks = TRUE;
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@ -158,7 +152,7 @@ gatherRewriteMeta(Query *parsetree,
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* two queries one w/rule_qual, one w/NOT rule_qual. Also add user
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* query qual onto rule action
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*/
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AddQual(sub_action, info->rule_qual);
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AddQual(sub_action, rule_qual);
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AddQual(sub_action, parsetree->jointree->quals);
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@ -168,23 +162,23 @@ gatherRewriteMeta(Query *parsetree,
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*
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* KLUGE ALERT: since ResolveNew returns a mutated copy, we can't just
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* apply it to sub_action; we have to remember to update the sublink
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* inside info->rule_action, too.
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* inside rule_action, too.
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*/
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if (info->event == CMD_INSERT || info->event == CMD_UPDATE)
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if (event == CMD_INSERT || event == CMD_UPDATE)
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{
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sub_action = (Query *) ResolveNew((Node *) sub_action,
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info->new_varno,
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new_varno,
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0,
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parsetree->targetList,
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info->event,
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info->current_varno);
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event,
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current_varno);
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if (sub_action_ptr)
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*sub_action_ptr = sub_action;
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else
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info->rule_action = sub_action;
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rule_action = sub_action;
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}
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return info;
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return rule_action;
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}
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/*
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@ -708,26 +702,14 @@ fireRules(Query *parsetree,
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foreach(r, actions)
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{
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Query *rule_action = lfirst(r);
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RewriteInfo *info;
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if (rule_action->commandType == CMD_NOTHING)
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continue;
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info = gatherRewriteMeta(parsetree, rule_action, event_qual,
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rt_index, event, *instead_flag);
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rule_action = rewriteRuleAction(parsetree, rule_action,
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event_qual, rt_index, event);
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/* handle escapable cases, or those handled by other code */
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if (info->nothing)
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{
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if (*instead_flag)
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return NIL;
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else
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continue;
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}
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results = lappend(results, info->rule_action);
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pfree(info);
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results = lappend(results, rule_action);
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}
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/*
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@ -1,13 +1,13 @@
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/*-------------------------------------------------------------------------
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*
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* rewriteHandler.h
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*
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* External interface to query rewriter.
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*
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*
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* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $Id: rewriteHandler.h,v 1.14 2001/01/24 19:43:27 momjian Exp $
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* $Id: rewriteHandler.h,v 1.15 2001/06/13 18:56:30 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -16,21 +16,7 @@
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#include "nodes/parsenodes.h"
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typedef struct RewriteInfo
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{
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int rt_index;
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bool instead_flag;
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int event;
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CmdType action;
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int current_varno;
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int new_varno;
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Query *rule_action;
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Node *rule_qual;
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bool nothing;
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} RewriteInfo;
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extern List *QueryRewrite(Query *parsetree);
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#endif /* REWRITEHANDLER_H */
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@ -1,22 +1,22 @@
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/*-------------------------------------------------------------------------
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*
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* rewriteManip.h
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*
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* Querytree manipulation subroutines for query rewriter.
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*
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*
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* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $Id: rewriteManip.h,v 1.26 2001/03/22 04:01:04 momjian Exp $
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* $Id: rewriteManip.h,v 1.27 2001/06/13 18:56:29 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef REWRITEMANIP_H
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#define REWRITEMANIP_H
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#include "rewrite/rewriteHandler.h"
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#include "nodes/parsenodes.h"
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/* RewriteManip.c */
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extern void OffsetVarNodes(Node *node, int offset, int sublevels_up);
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extern void ChangeVarNodes(Node *node, int old_varno, int new_varno,
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int sublevels_up);
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